Art of fireproofing wood.



owrance.

WILLIAM AUGUSTUS HALL, or

NEW YORK, 1\T.

., ASSIGNOR TO WILLIAM A. HALL LUMBER & FIBRE COMPANY, A CORPORATION OFVERMONT.

ART OF FIREPROOFING WOOD.

No Drawing.

To all whom it may concern:

Be it known that I, WILLIAM A. HALL, a citizen of the United-States,residing at New Yorlgin the county of New York'a'nd 1 State of New Yorkhave invented or discovered certain new and useful Improvements in theArt of Fireproofing Wood, of which the following is a specification.

The object of this invention or discovery i to render wood eiiicientlyfireproof without involving too much expense. To this end it has beendiscovered that a solution comprising, approximately, 12 parts ofchlorid of potassium, 22 parts of sulfate of magnesium, 17parts'of'chlorid of magnesium, an parts of chlorid of sodium will, whenforced into and throughout the wood, have a very efficient fireproofingeflect; In making the solution suflicient water is employed to entirelydissolve the above-mentioned ingredients. By preference I use a solutioncontaining about 21 pounds of the mixture to 100 pounds of water, thusmaking a solution of about 12 Baumt Wood which has been impregnated witha solution of this composition efficiently meets most of the usual firetests in a Very satisfactory manner; ,although its capacity for meetingthe flame test, or exposure to direct flame for a certaintime, isgreatly of the ingredients above mentioned about ten parts of phosphate"of ammonia.

Specification of Letters Patent.

Letters Patent:

improved by adding to the-solution Patented Oct. 28, 1913.

Application filed November 15, 1910. Serial No. 592,591.

In the fireproofingvprocess, the wood to be fireproofed is impregnatedor saturated with this new fireprooling composition in any well knownmanner by which the composition may be forced into and throughout thewood, as by immersing the wood in the fireproofing solution in thechamber of a closed cylinder or other receptacle, and then applying ahigh pressure to the chamber of the.cylinder or receptacle.

Having thus described my discovery I claim and desire to secure by 1. Afireproofing composition comprising an aqueous solution of about 12parts of chlorid of potassium, 22 parts sulfate of magnesium, 17 partschlorid of magnesium, and 27 parts chlorid of sodium. 2. A fireproofingcomposition comprising an aqueous solution of about 12 parts of chioridof potassium, 22 parts sulfate of magnesium, 17 parts chloridofmagnesium, 27 parts chlorid, of sodium, phosphate of ammonia.

In testimony whereof I aiiix my signature, in' presence of twowitnesses.

WILLIAM .AUGUs'rUs HALL.

- Witnesses I C. M; SWEENEY, FRED A. KLINGE.

and 10 parts of invention or

